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Highly Efficient Near‐Infrared Delayed Fluorescence Organic Light Emitting Diodes Using a Phenanthrene‐Based Charge‐Transfer Compound
Abstract
Significant efforts have been made to develop high‐efficiency organic light‐emitting diodes (OLEDs) employing thermally activated delayed fluorescence (TADF) emitters with blue, green, yellow, and orange–red colors. However, efficient TADF materials with colors ranging from red, to deep‐red, to near‐infrared (NIR) have been rarely reported owing to the difficulty in molecular design. Herein, we report the first NIR TADF molecule TPA‐DCPP (TPA=triphenylamine; DCPP=2,3‐dicyanopyrazino phenanthrene) which has a small singlet–triplet splitting (Δ EST) of 0.13 eV. Its nondoped OLED device exhibits a maximum external quantum efficiency (EQE) of 2.1 % with a Commission International de L′Éclairage (CIE) coordinate of (0.70, 0.29). Moreover, an extremely high EQE of nearly 10 % with an emission band at λ=668 nm has been achieved in the doped device, which is comparable to the most‐efficient deep‐red/NIR phosphorescent OLEDs with similar electroluminescent spectra.
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Cited by
Recent advances in organic thermally activated delayed fluorescence materials
Yang, Z., Mao, Z., Xie, Z., Zhang, Y., Liu, S., Zhao, J., Xu, J., Chi, Z., & Aldred, M. P. (2017) · Chemical Society Reviews · doi:10.1039/c6cs00368k · Cited by 2,395
All-organic thermally activated delayed fluorescence materials for organic light-emitting diodes
Liu, Y., Li, C., Ren, Z., Yan, S., & Bryce, M. R. (2018) · Nature Reviews Materials · doi:10.1038/natrevmats.2018.20 · Cited by 1,644
Self-citationGuo, J., Li, X., Nie, H., Luo, W., Gan, S., Hu, S., Hu, R., Qin, A., Zhao, Z., Su, S., et al. (2017) · Advanced Functional Materials · doi:10.1002/adfm.201606458 · Cited by 444
Data, P., Pander, P., Okazaki, M., Takeda, Y., Minakata, S., & Monkman, A. P. (2016) · Angewandte Chemie International Edition · doi:10.1002/anie.201600113 · Cited by 363
Kim, J. H., Yun, J. H., & Lee, J. Y. (2018) · Advanced Optical Materials · doi:10.1002/adom.201800255 · Cited by 314
Metadata
- Authors
- Wang, S., Yan, X., Cheng, Z., Zhang, H., Liu, Y., & Wang, Y.
- Venue
- Angewandte Chemie International Edition
- Publisher
- Wiley
- Published
- 2015-09-07
- Volume
- 54
- Issue
- 44
- Pages
- 13068-13072
- ISSN
- 1433-7851 (ISSN-L)
- 1521-3773
- OpenAlex
- W2154067684
- Cited by
- 605
- References
- 0
- FWCI
- 27.59
- Type
- journal article
- Language
- en
- Open access
- closed
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- Wang, S., Yan, X., Cheng, Z., Zhang, H., Liu, Y., & Wang, Y. (2015). Highly Efficient Near‐Infrared Delayed Fluorescence Organic Light Emitting Diodes Using a Phenanthrene‐Based Charge‐Transfer Compound. Angewandte Chemie International Edition. https://doi.org/10.1002/anie.201506687
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